In French, we have the Expression X lave plus blanc which translates word for word as X washes whiter. It comes from old TV advertisements where it was the typical argument to show that a new laundry detergent was better than others. It's now used in every possible way to ironically convey the idea that X is new so it's better.

I don't know an English expression that translates that idea with the same pinch of irony; can someone suggest one?

In the UK, "New Improved Labour" is a standard ironical term for the Labour Party as 'relaunched' by Tony Blair following the collapse in support for the party through the 80s and 90s. Blair & other 'modernisers' often referenced to the 'relaunched' party as 'New Labour'; it only became a cynical sobriquet when detractors inserted the word 'Improved'.
– FumbleFingersJun 30 '11 at 18:56

But beware, it's perhaps more often used to refer to "whitewashing" i.e. someone who is very good at covering their tracks. And sometimes it is used for someone who literally makes things cleaner (warning: link not suitable for people with weak stomachs!).

For a while people used to add, ".com!" onto the end of whatever they were saying to give it that irony, but I think that's over now. You could possibly get away with "I saw it on Facebook."

Some of my friends still say, "but its sooo shiny!" in reference to internet technologies that clog up web pages with constantly moving, "flash"-y stuff. It plays on the idea that simple minded people will be attracted to anything shiny and distracting, like a fish follows a lure or something.

We are technology geeks, so these things might not apply to everyone...